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C codechassisMedium severity

C1735Air Suspension LR Corner Up Timeout

The OBD2 code C1735 indicates a timeout issue with the left rear corner of the air suspension system, meaning that the system failed to raise the left rear corner within the expected time frame

Definition

The OBD2 code C1735 indicates a timeout issue with the left rear corner of the air suspension system, meaning that the system failed to raise the left rear corner within the expected time frame

Common causes

  • Faulty air suspension compressor
  • Leaking air spring or bag
  • Blocked air lines or fittings
  • Defective height sensor
  • Electrical connection issues (wiring or connectors)
  • Malfunctioning air suspension control module
  • Low air pressure in the system
  • Faulty relay or fuse related to the air suspension system

Common misdiagnoses

  • Faulty air suspension compressor
  • Leaking air bags or lines
  • Defective height sensors
  • Wiring issues or short circuits
  • Faulty control module
  • Incorrectly calibrated suspension system
  • Low air pressure in the system
  • Blocked or restricted air lines

Troubleshooting steps

  1. 1.Visual Inspection

  2. 2.Check for any visible damage to the air suspension components, including the air spring, air lines, and fittings

  3. 3.Inspect the left rear corner for any signs of leaks or wear

  4. 4.Check for Air Leaks

  5. 5.Use soapy water to check for air leaks in the air spring and associated lines. Bubbles will form at the site of any leaks

  6. 6.If leaks are found, repair or replace the affected components

  7. 7.Examine the Air Compressor

  8. 8.Ensure that the air compressor is functioning properly. Listen for unusual noises or lack of operation

  9. 9.Check the compressor relay and fuse to ensure they are working correctly

  10. 10.Inspect the Height Sensors

  11. 11.Check the height sensor on the left rear corner for proper operation. Ensure it is not damaged or misaligned

  12. 12.Test the sensor's electrical connections for corrosion or loose connections

  13. 13.Scan for Additional Codes

  14. 14.Use an OBD-II scanner to check for any additional trouble codes that may provide more context to the issue

  15. 15.Address any other codes that may be present, as they could be related

  16. 16.Check the Suspension Control Module

  17. 17.Inspect the suspension control module for any signs of damage or corrosion

  18. 18.Ensure that the module is receiving power and ground signals

  19. 19.Test the System Operation

  20. 20.Manually activate the air suspension system (if possible) to see if the left rear corner raises and lowers as expected

  21. 21.Monitor the system for any unusual behavior during operation

  22. 22.Inspect Wiring and Connectors

  23. 23.Check the wiring and connectors related to the air suspension system for any signs of damage, corrosion, or loose connections

  24. 24.Repair or replace any damaged wiring or connectors

  25. 25.Reset the System

  26. 26.After addressing any issues found, clear the trouble codes using an OBD-II scanner and test drive the vehicle to see if the code returns

  27. 27.Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the air suspension system. If the issue persists after performing these troubleshooting steps, it may be necessary to consult a professional mechanic or technician who specializes in air suspension systems for further diagnosis and repair